Biomass-Assisted Synthesis of Tiny Tin Nanoparticles Embedded in Nitrogen/Oxygen Self-Doped Carbon Nanosheets as High Performance Anode Materials for Sodium-Ion Batteries

摘要

Constructing high-performance anode materials through a simple and environmental method to push the development of sodium-ion batteries (SIBs) is desired. Herein, in this work, waste biomass peanut shells were used as templates and reductor to fabricate a series of tiny tin nanoparticles embedded in nitrogen/oxygen self-doped carbon (Sn@NOC) nanosheets via a convenient impregnation-pyrolysis strategy. When evaluated as anodes for SIBs, the optimal Sn@NOC-700 composite delivers the best electrochemical sodium storage performance with a high specific capacity, an excellent rate capability, and a long-term cycling stability for 2000 cycles at the current density of 1000 mA g~(-1). In addition, the sodium storage kinetics was analyzed by cyclic voltammetry at various scanning rates, which indicates the dominant capacitance contribution to sodium ion transport.